TREND enterprises, Inc. Owl-Stars! Number Line -20 to 120 Bulletin Bd. Set Owls, houses, and stars let you highlight numbers on this line to teach math patterns visually. Strips arranged by tens; stackable to show number patterns. Supports common math learning standards. Includes 14 number strips, 4 sliding houses, a zero piece, 12 odd and even labels, 6 Owl-Stars! Extra Value: Discovery Guide included with creative activities that teach and delight!